如何在camel-context.xml中使用xpath检查特定节点是否存在 [英] how to use xpath in camel-context.xml to check if a particular node is exist or not

问题描述

我正在尝试开发基于内容的路由骆驼应用程序.该应用程序将查看文件夹src/data，以查看是否有一个具有节点<e2d:getOrderDetaiRequest>的SOAP请求文件，然后将该文件复制到目标/消息中，否则将该文件复制到目标/其他中.

您知道如何使用xpath(或任何其他工具)检查该状况(我更喜欢使用camel-context.xml文件)吗?

这是我的骆驼语境

<route>
        <from uri="file://c:/src/data?noop=true"/>
        <choice>
           <when>
            <xpath>**???????????????????????????**</xpath>
                <to uri="file://c:/target/message"/>
           </when>
           <otherwise>
            <to uri="file://c:/target/other"/>
           </otherwise>
        </choice>
    </route>

这是2个不同的SOAP请求的示例

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:e2d="http://www.abc.com/Abc11WS">
   <soapenv:Header/>
   <soapenv:Body>
      <e2d:getOrderDetailRequest>
         <actionCode>1234</actionCode>
      </..>
   </...></...>

还有

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:lsr="http://www.abc.com/Abc22WS">
   <soapenv:Header/>
   <soapenv:Body>
      <lsr:getProductDetailsRequest>
           <productId>12345</...>
     </...></...></...>

解决方案

在使用xpath并且xml具有命名空间(例如SOAP消息)时，则还必须在xpath表达式中使用命名空间.

骆驼文档中有一些详细信息: http://camel.apache.org/xpath

通过在Camel中使用XML DSL，您可以直接在XML标签中声明名称空间，例如在camelContext等中.

<camelContext xmlns="http://camel.apache.org/schema/spring" e2d="http://www.abc.com/Abc11WS">
   ...
   <when>
     <xpath>/e2d:getOrderDetailRequest</xpath>
       ...

但是请注意，XPath可能很难正常工作.这就是为什么我们在Camel 2.10中添加了logNamespaces的原因.请参阅此页面底部的详细信息: http://camel.apache.org/xpath

I am trying to develop a content-based routing camel application. This application will look at the folder src/data to see if there is a SOAP request file that has node <e2d:getOrderDetaiRequest>, then that file will be copy into target/message, otherwise the file will be copy to target/other.

Do you know how to use xpath(or any other tools ) to check that condition (i prefer using camel-context.xml file)?

Here is my camel-context

<route>
        <from uri="file://c:/src/data?noop=true"/>
        <choice>
           <when>
            <xpath>**???????????????????????????**</xpath>
                <to uri="file://c:/target/message"/>
           </when>
           <otherwise>
            <to uri="file://c:/target/other"/>
           </otherwise>
        </choice>
    </route>

And here is the sample of 2 different SOAP requests

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:e2d="http://www.abc.com/Abc11WS">
   <soapenv:Header/>
   <soapenv:Body>
      <e2d:getOrderDetailRequest>
         <actionCode>1234</actionCode>
      </..>
   </...></...>

And

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:lsr="http://www.abc.com/Abc22WS">
   <soapenv:Header/>
   <soapenv:Body>
      <lsr:getProductDetailsRequest>
           <productId>12345</...>
     </...></...></...>

解决方案

When using xpath and your xml has namespaces, such as your SOAP message, then you must use namespaces in the xpath expression as well.

There is some details at the Camel docmentation at: http://camel.apache.org/xpath

By using the XML DSL in Camel you can declare the namespace in the XML tag directly such as in the camelContext etc.

<camelContext xmlns="http://camel.apache.org/schema/spring" e2d="http://www.abc.com/Abc11WS">
   ...
   <when>
     <xpath>/e2d:getOrderDetailRequest</xpath>
       ...

But mind that XPaths can be a bit tricky to get working correctly. And that is why we added the logNamespaces in Camel 2.10. See details in the bottom of the this page: http://camel.apache.org/xpath

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